Baonella henselae causes which disease?
**Core Concept**
Bartonella henselae is a gram-negative, facultative intracellular bacterium that causes cat-scratch disease, a zoonotic infection transmitted primarily through scratches or bites from infected cats.
**Why the Correct Answer is Right**
Bartonella henselae infects the lymph nodes of the affected limb, leading to swollen and painful lymph nodes, typically at the site of the scratch or bite. The bacteria cause an immune response, resulting in the characteristic symptoms of cat-scratch disease. The infection is usually self-limiting but can be severe in immunocompromised individuals.
**Why Each Wrong Option is Incorrect**
**Option A:** This is incorrect because Bartonella quintana is the causative agent of trench fever, a disease transmitted by the human body louse.
**Option B:** This is incorrect because Bartonella elizabethae is associated with endocarditis, particularly in patients with pre-existing heart conditions.
**Option C:** This is incorrect because Bartonella vinsonii subsp. berkhoffii is linked to endocarditis and other systemic infections, but not cat-scratch disease.
**Clinical Pearl / High-Yield Fact**
Cat-scratch disease is a classic example of a zoonotic infection, highlighting the importance of proper hygiene and handling of animals to prevent transmission of diseases.
**Correct Answer: D. Cat-scratch disease.**